Improved Dynamic Range in the Scanning Function for Electrophotographic Laser Printer/Scanner
Original Publication Date: 1984-Oct-01
Included in the Prior Art Database: 2005-Feb-05
An electrophotographic printer/scanner is produced by monitoring a scanning laser beam reflected from the toned photoconductor surface. By employing a laser wavelength for the scanning function, chosen to lie in the transparent region of the photoconductor, the intensity and dynamic range of the reflected signal are greatly enhanced. The electrophotographic printer/scanner accomplishes printing by modulating a scanning laser beam on and off to selectively discharge areas of the previously uniformly charged photoconductor, thereby yielding a latent charge image. This image is subsequently developed to produce a toned image. Scanning is performed on the toned image by a laser beam which utilizes the same optical system as that used for the printing function to deflect the beam.